Tumbling apparatus.



PATENTED APR. 2a, 1903 G. A. CURTIS. TUMBLING APPARATUS.

APPLICATION TILED JAN. 31, 1903.

no MODEL.

wziznesses:

m: NORRIS PETERS co, PHOTO-LUNG wasumcmu. n cy UNlTFlD Sterne 'arnn'r rricn.

GEORGE A. CURTIS, OF MEDFORD, MASSACHUSETTS, ASSIGNOR TO CHARLES F. BAKER, OF BOSTON, MASSACHUSETTS.

TUMBMNG APPARATUS.

SPECIFICATION forming part of Letters Patent No. 726,511, dated April 28, 1903.

Application filed January 31, 1908. Serial No. 141,224. (No model.)

To all whom it may concern: pulley 0, affixed to the projecting outer end Be it known that I, GEORGE A. CURTIS, of of the shaft, and a beltp, running on said pul- Medford, in the countyof Middlesex and State ley. Means are provided for exhausting air of Massachusetts, have invented certain new from the casing through the tubular trunnion 5 and useful Improvements in Tumbling Appab. For this purpose an exhaust-fan t is shown ratus, of which the followingis a specification. as communicating with the said tubular trun- This invention relates to apparatus for nion. Means are provided for admitting air tumbling nails and other metallic articles, and to the opposite end of the casing, said means, particularly for tumbling boot and shoe nails ashere shown, being air ducts or passages 10, IO which are formed between dies, the object of formed in the inclosed bearing a.

the tumbling operation being to remove the The construction above described does not fins which are left by the dies upon the edges differ materially from that set forth in the of the nails. above-mentioned Letters Patent, and the 0p- Theinvention is animprovementupon that eration of the apparatus as a whole is as dex5 set forth and'claimed in Letters Patent of the scribed in said Letters Patent, the casing Ct United States No. 721,027, dated February and shaft m being rotated simultaneously in 17,1903, for tumbling apparatus; and it conopposite directions and the air at the same sists in the improved means hereinafter detime exhausted through the tubular trunnion scribed and claimed for preventing the en- 1) to remove the sawdust employed at the com- 2o trance of the tumbled articles into the tubumencement of the operation to absorb the lartrunnions at the ends of the rotary casing. oil on the articles to be tumbled and the me- Of the accompanying drawings, forming a tallic dust, 820., detached from the articles part of this specification, Figure 1 represents by the tumbling operation, air being admitted a longitudinal vertical section of a tumbling at the opposite end through the ducts w. 25 apparatus embodying my invention. Fig. 2 In the operation of the apparatus shown in represents a section on line 2 2 of Fig. 1. the above-mentioned Letters Patent it was Fig. 3 represents a section on line 3 3 of Fig. 1. found that the tumbled articles have a tend- Fig. 4 represents a section on line 4 40f Fig. 1. ency to enter the tubular trunnions,'particu- Fig. 5 represents a side elevation of the guard larly the trunnion b, through. which the air 30 shown in Fig. 1. Fig. 6 represents a section is exhausted. In said patent I have shown on line 6 6 of Fig. 5. as a means forpreventing this tendency flar- The same reference characters indicate the ing or tapering portions c at the inner ends same parts in all the figures. of the trunnions o and g, said portions pre- In the drawings, (t represents a rotary cassenting downward and inward inclinations 35 ing adapted to contain a charge of nails or at the lower sides of the trunnions, which other articles to be tumbled, one end or head tend to cause nails which may enter the trunof the casing having a tubular trunnion b, nions to slide downwardly into the casing. journaled in a bearing 0, while the other end In carrying out my invention I provide adhas a tubular trunnion g, journaled in a bearditional means for overcoming the tendency 4o ing it. A shaft m is j ournaled at one end in of the tumbled articles to enter the trunnions, an inclosed bearing j within the casing a and to this end I attach to an inner end or (said bearing being in close proximity. to the head of the casing an annular guard 5. There trunnion b) and at its other end in an inmay be two of these guards, one at each end closed bearing uwithin the trunnion g. The of the casing, each guard surrounding the 45 shaft m is provided with suitable beatingentrance to the corresponding trunnion. I arms n, adapted to act on the articles to be have here shown but one of said guards, the tumbled. The casing a is adapted to be rosame surrounding the bearing j and the entated by means of a pulley cl, affixed to the trance to the trunnion Z). The said guard trunnion b, and a belt 6, running on said pulbesides being of annular form is preferably 50 ley. The shaft m, with its heaters, is adapted triangular in cross-section, its inner surface to be rotated in the opposite direction by a being formed to constitute an extension of the flaring or tapering portion 1 said extension projecting into the interior of the casing and by adding to the length of the flaring portion 0 correspondingly reducing the tendency of the tumbled articles to escape through the trunnion b. The guard s is affixed to the casing by means of bolts .9 s. The bearing j for the shaft on is preferably affixed to or formed as a part of the guard s, the guard, the bearing, and the arms connecting the bearing with the guard being preferably made in a single casting. To further counteract the tendency of the tumbled articles, especially when they are very small and light, to enter the trunnion b, I provide a screen 5 which may be a plate of perforated metal attached to the inner side of the guard and covering the annular space between the guard and the bearing j, the perforations in the plate being sufficiently large to permit the air, sawdust, &c., to be exhausted freely through it. I find that with any screen that is practicable in this connection some of the tumbled articles when they are of the smaller sizes are liable to find their way through the openings in the screen into the guard s, and to permit such articles to slide back into the casing on the inclined inner surface of the guard I provide slots or outlets .9 Fig. 3, between the margin of the screen a and the guard, said slots being of sufficient width to permit the return from the interior of the guard to the casing of' any tumbled articles that may find their way into the guard. It is obvious that a similar guard with or without a screen may be applied to the opposite end of the casing to surround the entrance to the tubular trunnion g. I have here shown a screen 8 attached to the casing in position to obstruct the entrance to the trunnion g. It is obvious that the guard 8 may be used without the screen .9 if desired.

I claim 1. A tumbling apparatus comprising a rotary casing having a tubular trunnion, a shaftbearing therein, and an annular guard attached to the interior of the casing and surrounding the bearing and the entrance to said trunnion.

2. A tumbling apparatus comprising a rotarycasing havingatubular trunnion, a shaftbearing therein, and an annular guard attached to the interior of the casing and sur rounding the bearing and the entrance to said trunnion, said guard having a tapered inner surface which is inclined downwardly and inwardly at its lower portion and acts to deflect back into the casing any articles that may find their way into the guard.

3. A tumbling apparatus comprising a rotary casing having a tubular trunnion the interior of which is flared or tapered at its inner end to give its lower surface a downward and inward inclination, a shaft-bearing'within said tapered interior, and an annular guard attached to the interior of the casing and surrounding the bearing and the entrance to the trunnion, said guard having a tapered inner surface constituting a continuation of the tapered internal surface of the trunnion.

4. A tumbling apparatus comprising a rotary casing having a tubular trunnion the interior of which is flared or tapered at its inner end to give its lower surface a downward and inward inclination, a shaft-bearing within said tapered interior, an annular guard at- GEORGE A. CURTIS.

Witnesses:

O. F. BROWN, E. BATCHELDER. 

